/*
 * Copyright 2020 eBlocker Open Source UG (haftungsbeschraenkt)
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be
 * approved by the European Commission - subsequent versions of the EUPL
 * (the "License"); You may not use this work except in compliance with
 * the License. You may obtain a copy of the License at:
 *
 *   https://joinup.ec.europa.eu/page/eupl-text-11-12
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package org.eblocker.lists.malware;

import org.eblocker.server.common.malware.MalwareEntry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

class PhishtankProvider implements MalwareProvider {
    private static final Logger log = LoggerFactory.getLogger(PhishtankProvider.class);

    private final PhishtankDownloader downloader;

    public PhishtankProvider(PhishtankDownloader downloader) {
        this.downloader = downloader;
    }

    @Override
    public MalwareEntries getMalwareEntries() throws MalwareListException {
        try {
            return mapEntries(downloader.retrieveEntries());
        } catch (IOException e) {
            throw new MalwareListException("i/o error", e);
        }
    }

    private MalwareEntries mapEntries(List<PhishtankEntry> entries) {
        List<MalwareEntry> filteredUrls = entries.stream()
                .collect(Collectors.groupingBy(PhishtankEntry::getUrl))
                .entrySet().stream()
                .map(e -> new MalwareEntry(e.getKey(), e.getValue().stream().map(PhishtankEntry::getTarget).distinct().toArray(String[]::new)))
                .collect(Collectors.toList());
        log.debug("found {} unique urls", filteredUrls.size());
        return new MalwareEntries(filteredUrls, Collections.emptyMap());
    }

}
